Abstract
Seismic identification of gas hydrates: A case study from Sakarya Canyon, western Black Sea
Highlights
Gas hydrates are crystalline solids formed of water and gas, and they naturally occur within shallow subsurface sediments at the continental margins with water depths typically exceeding 500 m
In the western Black Sea margin, high-resolution multichannel seismic (MCS) lines show Bottom-simulating reflections (BSRs) reflections in the continental rise area at water depths between 750 and 1950 m, lying between 70 to 350 ms below the seafloor, and they are interpreted as the base of the gas hydrate stability zone
They show the general characteristics of BSR reflections, such as high amplitudes, opposite polarity with respect to the seafloor, mimicking of the seafloor, and acoustic turbidity within the underlying sediments indicating free gas accumulations
Summary
Gas hydrates are crystalline solids formed of water and gas, and they naturally occur within shallow subsurface sediments at the continental margins with water depths typically exceeding 500 m. Bottom-simulating reflections (BSRs) in seismic sections coinciding with the base of the gas hydrate stability zone (BGHZ) are considered as one of the most prominent indications of subsurface gas hydrate occurrence (Kvenvolden et al, 1993; Andreassen et al, 1997). They determine the phase boundary between the hydrate in the gas hydrate stability zone (GHZ) and free gas in the underlying sediments. The BGHZ (or BSR) follows the isotherms since the stability of the gas hydrates
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